Revolving hook fo r sewi ng- m ach i n es



(ModeL) A. FARRAR. I REVOLVING HOOK' FOR SEWING MACHINES. No. 309.837.Patented Dec. 30, 1884.

W Q 'jm N. PETERS. Fhololj'hugmphur. wasnin lmlzc ing a loop-check uponthem.

IJ'NrrEn STATES PATENT Ost ich.

ARTHUR FARRAR, OF CHICAGO, ILLINOIS.

REVOLVING HOOK FOR SEWING-MACHINES.

SPECIFICATION forming part of Letters Patent No. 309,837, dated December30, 1884.

Application filed March 26, 1883. (Model.)

To all whom it may concern Be it known that I, ARTHUR FARRAR, residingat Chicago, in the county of Cook and State of Illinois, and a citizenof the United States, have invented new and useful Improvements inRevolving Hooks for Sewing- Machines, of which the following is a fulldescription, reference being had to the accompanying drawings, in which'Figure 1 is an elevation showing the face of the rotating hook with thebobbin-case inserted therein. Fig. 2 is an elevation showing the face ofthe rotating hook with the bobbin-case and bobbin removed. Fig. 3 is aside elevation of the rotary hook. Fig. 4 is a section at line a: ofFig. 3. Fig. 5 is an elevation of the bobbin-case. Fig. 6 is an insideview of the bobbin-case with the bobbin removed. Fig. 7 is a section atline g of Fig. 6. Fig. 8 is an elevation of the bobbin. Fig. 9 is anedge or end view of the bobbin-case.

My invention relates to those machines of the Vheeler & Vilson patternthat use a loop-check, and also to bobbin-cases hav- The tendency ofloop-checks which are upon the bobbincase or upon the ring-slide is topull the loop out of the groove out from the hookthroat to the cast-off,resulting in double looping. To prevent this I make a horn or projectionon the periphery of the hook, or in the groove leading to the cast-off,and considerablyto theleft of the plane of the hook-point or I outanother groove by the side of or at the bottom of the ordinary one, andleading to or toward the face or edge of the hook, so as, in effect, toform aprojection, and thus accomplish the same result, which is to holdthe loop to the left and out of the reach of the hookpoint while thelatter is passing it; secondly, my improvement is designed to facilitatethe unwinding of the bobbin-thread by allowing the bobbin, whenever,from any cause, it unwinds with difficulty, (as when it is nearly empty,for instance,) to turn upon a center pin in the bobbin-case, and bycutting away the upper side of said center pin the-bobbin can fall sothat its periphery will rest on the case, thereby stopping it morequickly and preventing a great excess of thread from unwinding; thirdly,another object is to prevent the thread from drawing the bobbincase upinto the opening between the heel and point of the hook, which, if done,may cause the bobbin-case to be carried too far and draw too much threadfrom the bobbin, and this I accomplish by means of a groove in the faceof the rotary hook, into which the edge of the bobbin-case passes;fourthly, another object is to provide a place in the case for slackthread and prevent it from passing out over the edge of the bobbin,which I accomplish by making a groove or recess upon the inside of thebobbincase; fifthly, another object is to facilitate the adjustment ofthe bobbinthread ready for use, which I accomplish by providing thebobbin-case with a spring, a pin, and a notch, all as hereinafter fullydescribed.

In the drawings, A represents a rotating hook, such as is adapted to beused in the Wheeler & WVilson sewing-machine, being represented in theposition which it occupies when the needle is at its lowest point. a isa projection or hook on the rear side of the hook-throat, which isadapted to catch and hold one side of the loop over to the left untilthe point of the hook has passed the needle-thread. 7

I do not limit myself to the exact form or position of the projection awhich is shown in the drawings.

13 is the bobbin'case.

bis a groove or recess in the face of the hook A, having two side walls,into which the edge a of the bobbin-case passes; hence the bobbin-casecannot be drawn up into the opening between the heel and the point ofthe hook by the action of thread on the loopcheck, the upward movementof the bobbincase being prevented by the engagement of the edge of thecase with the wall of the groove 1).

d is the center pin in the case, which passes through the bobbin 0 whenin place; and this pin is cut away or flattened upon that side which isthe upper side when in use, as shown at c, Fig. 6, so that the bobbincan drop down a little, bringing its edge in contact with the inside ofthe bobbin-case at a point about opposite to the flattened part of thecenter pin d, for the .purpose of arresting more quickly the movement ofthe bobbin after the proper amount of thread has been drawn from thebobbin. This does not prevent the free rotation of the bobbin on the pin(1, because the tendency is to lift the bobbin away from the lower edgeof the case.

f is a recess or groove out upon the inside of the edge of the case B,as shown in Fig. 7, and extending partially around such inside of theedge of the case. Into this recess f the slack thread can pass and beprevented from passing out over the edge of the bobbin.

9 is aspring secured at one end to the bobbin-case, as shown in Fig. 6,to give tension to the bobbin-thread as against the movement of theloop-check.

a is a notch in the edge of the bobbin-case opposite the end of thespring 9. i is another notch in the edge of the case, terminating in athread-eye The bobbin-th read can be easi] y adjusted for use by passingit into the notch n and under the free end of the spring {1 and over thepin it, then between the spring and edge of the case, then into thenotch 11. Thus the threading of the bobbin-case is offected withoutpassing the thread through any hole.

I am aware of Patent N 0. 136,314, and I do not claim anything which isshown therein.

Vhat I claim, and desire to secure by Let ters Patent, is as follows:

1. A rotary bobbin carrying hook eonstrueted with the horn or projectiona within the entrance of the groove forming the hookthroat, andextending laterally from the rear side of said hook-throat, the horn orprojection acting to hold the thread-loop laterally,

flattened upon one side, in combination with I hook, substantially asdescribed.

3. The bobbin-case B, having a center pin, d,

a bobbin fitting on said pin, and having a vertical movement thereon byreason of the fiattened pin, substantially as described.

4. A bobbin-case, B, provided on theinside of its edge with the groove1, to receive the slack thread from the bobbin, to prevent it frompassing out over the edge of the latter, substantially as described.

5. The bobbin-case B, having the circular rim having the attachedinterior flat spring, 9, and constructed in its edge 0 with the notchat, opposite the free end of the spring, and the notch t, terminating ina threadeye, in c0n1- bination with the laterally-projecting pin hwithin thecase, around which the thread is 6 carried for threading thebobbin-case, sub stantially as described.

ARTHUR FARRAR.

\Vitnesses:

ALBERT H. ADAMS, O. \V. BOND.

